Roosters or hens?

i have two mixed breed chicks, pip a mix of sultan and one of my x- battery hans (not sure what breed she is) and penny a mix of sultan and a grey hen that i have (not sure what breed she is either but you can see in my photos). they are both 8 weeks old and we think penny is a rooster and pip is a hen. i poasted a thread a couple of weeks ago and people thaught the same, but thaught they were a little too young. what do you think they are? here are some pics;